[clang] [BuiltinsX86] Use long long for the __int64 MS intrinsics (PR #154946)

[Jannik Voss via cfe-commits]

vossjannik wrote:

Squashed into one commit, rebased, and added `clang/test/Sema/ms-x86-builtins-int64-lp64.c`: on x86_64-linux-gnu `-fms-extensions`, current main rejects the __int64 declarations of these ten intrinsics - the types intrin0.h and xsaveintrin.h use - with ten "conflicting types" errors. With the patch they are accepted; the x86_64-pc-windows-msvc RUN line passes either way. @rnk could one of you take a look?

https://github.com/llvm/llvm-project/pull/154946